MCQ-1: Inheritance

What term is used for the transference of a gene from one organism to another?

The family tree shows the inheritance of the ability to taste a certain substance. The allele for the ability to taste this substance is dominant to the allele for the inability to taste it.

What is the chance of the second child of Peter and Hannah being a ‘non-taster’?

What is always found in female gametes and may be found in male gametes?

In rabbits, the allele for dark fur, R, is dominant to the allele for white fur, r.
The diagram shows a cross between a rabbit with dark fur and a rabbit with white fur.

What are the genotypes of the offspring?

Which types of variation can be inherited?

Which statement describes human cells formed by meiosis?

A short-toed animal was crossed with a long-toed animal of the same species. All the offspring had short toes. One of these offspring was crossed with another long-toed animal of the same species.
Which ratio of short-toed to long-toed animals should be expected?

In pea plants, the allele for tall stems is dominant to the allele for short stems.
A heterozygous tall plant is crossed with a short plant, and 100 offspring are produced.
How many of the offspring are likely to be tall?

The nucleus in a body cell of a fly contains 12 chromosomes.
How many chromosomes are there in the nucleus of a sperm from this fly?

In a species of plant, the allele for red flowers (R) is dominant over the allele for white flowers (r).
Two red–flowered plants were crossed.

What are the genotypes of the parents?

In cats, the allele for short hair is dominant to the allele for long hair. A short-haired cat gives birth to five kittens. Two of them have long hair.
Which statement must be correct?

Cystic fibrosis is an inherited disease that occurs when an individual is homozygous for a recessive allele.
If parents are both heterozygous for this characteristic, what is the probability that their first child will have cystic fibrosis?

What determines the sex of a baby?

When white-flowered pea plants are crossed with red-flowered pea plants, the offspring (F₁) all have red flowers.
If these F₁ plants pollinate themselves, the next generation (F₂) contains both red and whiteflowered plants.
Which statement explains this?

The graph shows the masses of two different types of tomato.

What can be concluded from the graph?

Genetics is the study of

What is unlikely to be affected by the environment?

Which statement is true of both chromosomes and genes?

A genetic cross between two organisms may be shown as Gg × Gg.
What does g represent?

Some fruit flies have orange eyes and others have red eyes.
If two orange-eyed fruit flies are crossed, their offspring always have orange eyes.
If two red-eyed fruit flies are crossed, their offspring sometimes include both orange-eyed and red-eyed flies.
What can be concluded from these observations?